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Major Customers and Concentration of Credit Risk (Tables) | 12 Months Ended
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Dec. 31, 2017
Risks and Uncertainties [Abstract] |
Schedule of major customers and concentration risks |
Customer | 2017 Revenue |  | % of Total Revenue |  | 2016 Revenue |  | % of Total Revenue |  | 2015 Revenue |  | % of Total Revenue
MedImmune | $ | 22,269,773 |  |  | 53 | % |  | $ | 1,518,639 |  |  | 4 | % |  | $ | 16,037,731 |  |  | 40 | %
DARPA | 9,983,927 |  |  | 24 |  |  | 26,602,183 |  |  | 75 |  |  | 11,582,623 |  |  | 28 |
Roche | 6,107,254 |  |  | 14 |  |  | 4,917,929 |  |  | 14 |  |  | 10,778,688 |  |  | 27 |
NIAID | — |  |  | — |  |  | 118,171 |  |  | — |  |  | 901,475 |  |  | 2 |
GeneOne (affiliated entity) | 551,208 |  |  | 1 |  |  | 1,188,432 |  |  | 4 |  |  | 450,000 |  |  | 1 |
All other | 3,307,924 |  |  | 8 |  |  | 1,023,007 |  |  | 3 |  |  | 821,594 |  |  | 2 |
Total revenue | $ | 42,220,086 |  |  | 100 | % |  | $ | 35,368,361 |  |  | 100 | % |  | $ | 40,572,111 |  |  | 100 | %

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